---
title: GPT‐5.4 in Deep
link: https://ampcode.com/news/gpt-5.4
source: ampcode-com
published: 2026-03-26T00:00:00Z
updated: 2026-03-26T00:00:00Z
first_seen: 2026-10-03T23:09:50.514863041Z
summary: 'GPT-5.4 now powers Amp''s deep mode. It''s the best model in the world right now. It''s faster than GPT-5.3-Codex and still as great at coding. But, out of the box, GPT-5.4 was too chatty. That''s not what we want for deep; it''s not a pair programmer, it''s supposed to go off and solve the problem. So we tuned GPT-5.4 to behave like GPT-5.3-Codex. Once we had that, we started to use it exclusively; even for interactive tasks. We run it at very high reasoning (deep^3) and still prefer it when we need fast interaction and fast reaction. It takes steering better than GPT-5.3-Codex. To use it: open the command palette with Ctrl-O and run the command mode: use deep in the Amp CLI, or select deep mode in the Amp editor extension''s prompt field. By default it uses deep^2, you can switch to deep^3 by hitting Opt-D.'
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---

GPT-5.4 now powers Amp's [deep mode](https://ampcode.com/news/deep-mode).

It's the best model in the world right now.

It's faster than GPT-5.3-Codex and still as great at coding.

But, out of the box, GPT-5.4 was too chatty. That's not what we want for `deep`; it's not a pair programmer, it's supposed to go off and solve the problem.

So we tuned GPT-5.4 to behave like GPT-5.3-Codex.

Once we had that, we started to use it exclusively; even for interactive tasks. We run it at very high reasoning (`deep^3`) and still prefer it when we need fast interaction and fast reaction. It takes steering better than GPT-5.3-Codex.

To use it: open the command palette with `Ctrl-O` and run the command `mode: use deep` in the Amp CLI, or select `deep` mode in the Amp editor extension's prompt field. By default it uses `deep^2`, you can switch to `deep^3` by hitting `Opt-D`.